PS1 multiline with colors

[BASTIDON , Stéphane]

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: cygwin
Compiler: gcc-4
Compilation CFLAGS:  -DPROGRAM='bash.exe' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='cygwin' -DCONF_MACHTYPE='i686-pc-cygwin' -DCONF_VENDOR='pc' 
-DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H 
-DRECYCLES_PIDS   -I.  -I/usr/src/bash-4.1.10-4/src/bash-4.1 
-I/usr/src/bash-4.1.10-4/src/bash-4.1/include 
-I/usr/src/bash-4.1.10-4/src/bash-4.1/lib  -I/usr/include/ncursesw -g -O2 -pipe 
uname output: CYGWIN_NT-5.1 fr-31-01-07-021 1.7.20(0.266/5/3) 2013-06-07 11:11 
i686 Cygwin
Machine Type: i686-pc-cygwin

Bash Version: 4.1
Patch Level: 10
Release Status: release

Description:
        Adding colors on last line of PS1 cause caractere shift on history 
recall

Repeat-By:
        With mintty terminal:
        PS1='\h Hello everybody\n\e[1;35m\]Hi\e[0m\]>'
        << cursor up >>
        << cursor down >>
        the line look like:
        Hi>PS1='\h Hello

        With putty terminal (with default configuration):
        with the same PS1, when the cursor is on the last line of the terminal
        when I call back a long command (displayed on 2 or more lines) from 
history
        this line is badly displayed.

Fix:
        [Description of how to fix the problem.  If you don't know a
        fix for the problem, don't include this section.]